Detecting mixedness of qutrit systems using the uncertainty relation

We show that the uncertainty relation as expressed in the Robertson-Schrodinger generalized form can be used to detect the mixedness of three-level quantum systems in terms of measureable expectation values of suitably chosen observables when prior knowledge about the basis of the given state is known. In particular, we demonstrate the existence of observables for which the generalized uncertainty relation is satisfied as an equality for pure states and a strict inequality for mixed states corresponding to single as well as bipartite sytems of qutrits. Examples of such observables are found for which the magnitude of uncertainty is proportional to the linear entropy of the system, thereby providing a method for measuring mixedness.Comment: 7 pages, 2 figure, Eqs.(10) and (14) are corrected, and results and conclusions are unchange

A Systems Approach to Increasing Awareness and Coordination of Student Retention and Completion at a Canadian College

As competition for students and scarce resources increases due to political and economic pressures, awareness and coordination of student retention and completion become a critical priority for post-secondary institutions. However, despite increased attention on Strategic Enrolment Management (SEM) (Black, 2010; Gottheil & Smith, 2011; Hossler & Bontrager, 2015; Wilkinson et al., 2007) and the growth of retention-focused student services in recent years, retention rates remain unchanged (Habley, Bloom, & Robbins, 2012). Post-secondary students are in the midst of a significant transition period (Tinto, 1993) and face challenges related to mental health and wellness, relationships, rigors of academic life, and personal finances (Braxton, Hirschy, & McClendon, 2006; Tinto, 1993). Furthermore, complex institutional structures are increasingly difficult for students to navigate (Karp, 2011) and are not designed around the needs of Generation Z learners (Seemiller & Grace, 2016). This Organizational Improvement Plan (OIP) describes a “whole-system” solution to the problem that sorts, connects, supports, and transforms students while also transforming the institution (Beatty-Guenter, 1994). This plan describes how the higher education registrar is uniquely positioned within the organization to lead change (Duklas, 2014; Waters & Hightower, 2016) and identifies a compatible systems approach to leadership (Coffey, 2010; Senge, Hamilton, & Kania, 2015) that may be employed. To accelerate and sustain change so that it becomes embedded within organizational culture (Kotter, 2014), key stakeholders representing multiple campus subsystems (Kalsbeek, 2006a, 2006b, 2007) are engaged throughout the process

A study of global monopole in Lyra geometry

A class of exact static solution around a global monopole resulting from the breaking of a global S0(3) symmetry is obtained in the context of Lyra geometry. Our solution is shown to possess an interesting feature like wormholes space-time. It has been shown that the global monopole exerts no gravitational force on surrounding non-relativistic matter.Comment: 6 pages, Published in Mod.Phys.Lett.A19:2785-2790,200

Critical current of a superconductor measured via injection of spin polarized carriers

In this paper we report a direct evidence of the suppression of critical current due to pair-breaking in a superconducting micro-bridge when the measurement is carried out by injecting spin polarised carriers instead of normal electrons. A thin layer of La0.7Ca0.3MnO3 was used as the source of spin polarised carriers. The micro-bridge was formed on the DyBa2Cu3O7-d thin film by photo-lithographic techniques. The design of our spin-injection device allowed us to inject spin-polarised carriers from the La0.7Ca0.3MnO3 layer directly to the DyBa2Cu3O7- d micro-bridge (without any insulating buffer layer) making it possible to measure the critical current when polarised electrons alone are injected into the superconductor. Our results confirm the role of polarised carriers in breaking the Cooper pairs in the superconductor.Comment: 8 pages, 4 figure